CN111337869A

CN111337869A - BMS board testing device, testing system and testing method

Info

Publication number: CN111337869A
Application number: CN202010138269.1A
Authority: CN
Inventors: 杨磊; 彭如谋
Original assignee: Shanghai Junzheng Network Technology Co Ltd
Current assignee: Shanghai Junzheng Network Technology Co Ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-06-26
Anticipated expiration: 2040-03-03
Also published as: CN111337869B

Abstract

A BMS board testing device, system and method, characterized by that, this testing device includes: the device comprises a power supply module, a parameter adjusting module and a parameter collecting module, wherein the power supply module is used for simulating a lithium battery and can generate a first voltage with adjustable voltage range; the parameter adjusting module is connected with the power supply module and used for simulating a normal working state and/or an abnormal working state of the lithium battery during working; and an interface for connecting with the BMS board is arranged; and the parameter acquisition module is connected with the parameter adjustment module and is used for detecting actual parameters when the parameter adjustment module is output to the BMS board after parameter adjustment. According to the invention, the voltage output and the working state of the lithium battery are simulated by building the circuit module to replace the lithium battery required in the test, so that the test of the BMS board can be completed without depending on the lithium battery, the test period can be further shortened, the test efficiency is improved, and the test safety is ensured.

Description

BMS board testing device, testing system and testing method

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of lithium batteries, in particular to a BMS board testing device, a BMS board testing system and a BMS board testing method.

[ background of the invention ]

In order to ensure the safe and normal use of the lithium batteries, each lithium battery is provided with a BMS (battery protection SYSTEM) board for collecting lithium battery information, such as voltage, current, temperature, SOC and other relevant indexes.

Test BMS board must arrange the lithium cell under the normal conditions and carry out whole package test, changes information such as voltage, electric current, temperature that the BMS board was gathered through to whole package lithium cell charge-discharge, goes to change the abnormal conditions that meets in order to simulate practical application again in relevant parameter to detect the BMS board and can normally work. Due to the fact that the lithium battery is long in charging and discharging time and high-risk conditions such as short circuit of battery output are involved, time-consuming and frequent testing methods for testing the BMS board are complex and extremely unsafe. Therefore, there is a need for testing BMS boards in a more efficient and safer way.

[ summary of the invention ]

The present invention is directed to solving the above problems, and provides a BMS board testing apparatus, a BMS testing system, and a BMS testing method for testing a BMS by constructing a circuit to simulate a normal operation state and/or an abnormal operation state when a lithium battery is outputted and operated.

In order to accomplish the above object, the present invention provides a BMS board testing device, characterized by comprising:

the power supply module is used for simulating a lithium battery and can generate a first voltage with adjustable voltage range;

the parameter adjusting module is connected with the power supply module and used for simulating a normal working state and/or an abnormal working state when the lithium battery works; and an interface for connecting with the BMS board is arranged;

and the parameter acquisition module is connected with the parameter adjustment module and is used for detecting actual parameters when the parameter adjustment module outputs the parameters to the BMS board after the parameters are adjusted.

Further, the parameter adjusting module comprises:

and the single battery voltage simulation module is connected with the power supply module and can divide the first voltage and output a second voltage with adjustable range so as to simulate the voltage output of the single battery.

Further, the cell voltage simulation module includes:

the voltage dividing circuit is provided with a plurality of voltage dividing branches which are arranged in parallel, the voltage dividing branches comprise voltage dividing resistors R1 and varistors R2 which are arranged in series, one end of each voltage dividing resistor R1 is connected with the positive electrode of the power supply module, the other end of each voltage dividing resistor R1 is connected with the corresponding varistor R2, the other end of each varistor R2 is connected with the negative electrode of the power supply module, and the second voltage is output from the connection position of the voltage dividing resistors R1 and the varistors R2;

and the voltage interface is respectively connected with the connecting part of the divider resistor R and the rheostat R and is used for being connected with a voltage acquisition port of the BMS board.

Further, the parameter acquisition module comprises:

and the voltage collector is connected with a second voltage output of the voltage division branch and used for collecting a second voltage value output by the single battery voltage simulation module.

Further, the parameter adjusting module comprises:

and the discharge simulation module is used for simulating the current output when the lithium battery discharges through the BMS board.

Further, the discharge simulation module includes:

electronic load, the power consumption can be adjusted;

and the current interfaces are respectively connected with two ends of the electronic load and are used for being connected with the current acquisition port of the BMS board.

Further, the parameter acquisition module comprises:

and the current collector is connected between the electronic load and the current interface in series and is used for collecting the current value of the power supply module when the power supply module discharges through the BMS board.

Further, the parameter adjusting module comprises:

and the temperature simulation module is connected with the power module and used for simulating the temperature change of the lithium battery during working.

Further, the temperature simulation module includes:

the temperature interface is used for being connected with a temperature acquisition port of the BMS board;

and one end of the first potentiometer is connected with the negative electrode of the power supply module, and the other end of the first potentiometer is connected with the temperature interface.

Further, it still includes:

and the communication module is connected with the computer terminal loaded with the test program and is used for being connected with the communication interface of the BMS board so as to realize the communication between the computer terminal and the BMS board and verify the communication capability of the BMS board.

Further, the power module comprises an AC-DC power supply and a second potentiometer, the AC-DC power supply adopts an LLC topological structure, the range of the first voltage is 0-60V, and the range of the second voltage is 0.5-4.5V.

Further, the testing device comprises the BMS board testing device and a computer terminal loaded with a testing program, wherein the computer terminal is in communication connection with the BMS board testing device, the BMS board testing device can test a BMS board to be detected by simulating the output and the working state of a lithium battery, and the computer terminal can evaluate the testing result of the BMS board according to actual parameters set by the BMS board testing device when the BMS board testing device simulates the lithium battery and the parameters collected by the BMS board.

Further, the protection device also comprises an oscilloscope, wherein the oscilloscope is used for being connected with the BMS board to detect whether the protection action speed of the BMS board meets the design requirement.

In addition, the invention also provides a BMS board testing method, which comprises the following steps:

s1: simulating a lithium battery by using a power supply module to generate a first voltage with adjustable voltage range;

s2: connecting a parameter adjusting module with the power supply module to simulate a normal working state and/or an abnormal working state of the lithium battery during working;

s3: and connecting a parameter acquisition module with the parameter adjusting module to detect actual parameters when the parameter adjusting module is output to the BMS board after parameter adjustment.

Further, the parameter adjusting module comprises a single battery voltage simulation module, a discharge simulation module and a temperature simulation module; step S2 includes:

s21: dividing the first voltage by using a single battery voltage simulation module and outputting a second voltage with adjustable range to simulate the voltage output of a battery monomer;

s22: simulating current output of a lithium battery when the lithium battery is discharged through the BMS board by using a discharge simulation module;

s23: and simulating the temperature change of the lithium battery during working by using a temperature simulation module.

Further, the parameter acquisition module comprises a voltage collector and a current collector; step S3 includes:

s31: connecting the voltage collector with the second voltage output to collect a second voltage value output by the single battery voltage simulation module;

s32: and connecting the current collector in the discharge simulation module in series to collect the current value of the power supply module when the power supply module discharges through the BMS board.

Further, it also includes step S4: and collecting the state parameters of the BMS board, and analyzing the state parameters of the BMS board and the actual parameters collected by the parameter collection module to evaluate the test result of the BMS board.

According to the invention, the voltage output and the working state of the lithium battery are simulated by building the circuit module to replace the lithium battery required in the test, so that the BMS board can be tested without depending on the lithium battery; the circuit module of setting up can be convenient simulate out each item working parameter of lithium cell through artificial regulation, through gathering these parameters after adjusting to carry out comparative analysis with each item relevant parameter that it gathered with the BMS board, just can assess the collection function and the calculation function etc. of BMS board, accomplish the functional test to the BMS board. Because the invention simulates the work of the lithium battery through the circuit module, the lithium battery does not need to be actually used for carrying out the whole-pack test during the test, and the test safety can be greatly improved; in addition, the actual charging and discharging time of the lithium battery is longer, so that the testing time is long, and the circuit module can rapidly adjust parameters to simulate the charging and discharging state of the lithium battery, so that the testing period can be greatly shortened, and the testing efficiency is improved.

[ description of the drawings ]

Fig. 1 is a schematic block diagram of the present invention.

Fig. 2 is a block diagram of a parameter adjustment module.

Fig. 3 is a block diagram of a parameter acquisition module.

Fig. 4 is a schematic circuit connection diagram of the BMS board testing device and the BMS board, wherein fig. 4A is a schematic circuit connection diagram of the BMS board and an interface thereof; FIG. 4B is a schematic diagram of the connection between the cell voltage simulation module and the voltage module; FIG. 4C is a schematic diagram of the connection between the discharge simulation module and the current collector; FIG. 4D is a schematic diagram of the connection of a voltage collector; FIG. 4E is a schematic diagram of a connection of a communication module; fig. 4F is a schematic connection diagram of the temperature simulation module.

The attached drawings indicate the following: the device comprises a power module 10, an AC-DC power supply 11, a second potentiometer 12, a parameter adjusting module 20, a single battery voltage simulation module 21, a voltage dividing circuit 211, a voltage dividing branch 2111/voltage interface 212, a discharge simulation module 22, an electronic load 221, a current interface 222, a temperature simulation module 23, a temperature interface 231, a first potentiometer 232, a parameter acquisition module 30, a voltage collector 31, a current collector 32, an oscilloscope, a communication module 40, a computer terminal 50, a BMS board 60, a voltage acquisition port 61, a current acquisition port 62 and a temperature acquisition port 63.

[ detailed description ] embodiments

The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.

Example 1

As shown in fig. 1, the present embodiment provides a BMS board testing device including a power module 10, a parameter adjusting module 20, a parameter collecting module 30; further, it may also include a communication module 40. The power module 10 is used for simulating a lithium battery to generate a first voltage with an adjustable voltage range. The parameter adjusting module 20 is used for simulating a working state of the lithium battery during working, namely a normal working state and/or an abnormal working state. The parameter collecting module 30 is used to collect actual parameters when the parameter adjusting module 20 outputs the parameters to the BMS board 60 after parameter adjustment, so that the actual parameters and the parameters collected by the tested BMS board 60 can be conveniently compared and analyzed, and the function of the BMS board 60 can be tested.

The BMS board testing arrangement of this embodiment's main points lie in, simulate the required lithium cell when voltage output and the operating condition of lithium cell are in order to replace the test through setting up circuit module to can not rely on the lithium cell and accomplish the test of BMS board 60, and then shorten test cycle, improve efficiency of software testing, and guarantee test safety.

As shown in fig. 1 and 4B, the power module 10 can generate a first voltage with an adjustable voltage range. The range of the first voltage can be set according to requirements, and in the embodiment, the range of the first voltage is 0-60V, which is a direct current voltage. The power module 10 includes a high power, high precision AC-DC power supply 11 and a second potentiometer 12. In this embodiment, the AC-DC power supply 11 can generate 60V DC output, and the power module 10 can output 0-60V DC voltage by adjusting the second potentiometer 12. In order to meet the EMC (Electro Magnetic Compatibility ) requirement, the AC-DC power supply 11 of the present embodiment adopts an LLC power supply topology, and has the advantages that a primary MOSFET ZVS (Zero voltage Switch) of the converter is turned on, an output diode ZCS (Zero current Switch) is turned off, there is no reverse recovery problem, the switching loss is small, and the AC-DC power supply is suitable for high frequency and high power density design, and the EMC performance is excellent. The second potentiometer 12 is a well-known high-precision potentiometer, so that the precision of the first voltage output by the power module 10 is controlled.

As shown in fig. 2, the parameter adjusting module 20 includes a cell voltage simulation module 21, a discharge simulation module 22, and a temperature simulation module 23.

As shown in fig. 3, the parameter collecting module 30 includes a voltage collector 31 and a current collector 32.

As shown in fig. 2 and 4B, the cell voltage simulation module 21 is configured to divide the first voltage to output a second voltage with an adjustable range, so as to simulate the voltage output of the battery cell. The single battery voltage simulation module 21 is connected to the power module 10, and includes a voltage dividing circuit 211 and a voltage interface 212. The voltage dividing circuit 211 is used for simulating the output of the single battery, and the voltage interface 212 is used for connecting the voltage collecting port 61 of the BMS board 60, so as to test the BMS board 60.

As shown in fig. 2 and fig. 4B, the voltage dividing circuit 211 includes a plurality of voltage dividing branches 2111 connected in parallel. Each branch voltage dividing branch 2111 is used for simulating the voltage output of one battery cell. The number of the voltage dividing branches 2111 can be set according to needs, and the number of the voltage dividing branches 2111 is more than that of the single lithium battery cells. In this embodiment, the voltage dividing branch 2111 has 13 branches. Each of the voltage dividing branches 2111 includes a voltage dividing resistor R1 and a varistor R2, which are connected in series. One end of the voltage dividing resistor R1 is connected to the positive electrode of the power module 10, i.e., the output end of the second potentiometer 12. The other end of the voltage dividing resistor R1 is connected to the varistor R2, and the other end of the varistor R2 is connected to the negative electrode of the power module 10. The resistance of the divider resistor R1 can be set as required, and in this embodiment, the divider resistor R1 is a resistor of K Ω level, so that the safety of the power module 10 can be ensured when the resistance of the varistor R2 is adjusted to 0 ohm. The voltage dividing resistor R1 is preferably a high precision resistor. The varistor R2 can be selected from known high-precision sliding varistors. In this embodiment, the step precision of the rheostat R2 is 50 mV.

As shown in fig. 4B, a second voltage with adjustable range can be outputted by connecting the divider resistor R1 and the varistor R2. The range of the second voltage is 0.5-4.5V. In other words, by adjusting the rheostat R2, the second voltage of each of the voltage dividing branches 2111 can be varied and outputted within a range of 0.5 to 4.5V.

As shown in fig. 4A and 4B, the voltage interface 212 is connected to the connection between the voltage dividing resistor R1 and the varistor R2, and is used for connecting to the voltage collecting port 61 of the BMS board 60 so as to output the second voltage to the BMS board 60, so that the BMS board 60 can collect the simulated output voltages of the respective unit cells, thereby testing the unit voltage collecting function of the BMS board 60. In this embodiment, there are 13 voltage interfaces 212. The voltage interface 212 may be provided in a form as required, and may be provided in a form convenient to connect, for example, in a form of a plug terminal or the like.

As shown in fig. 4A and 4B, the voltage collector 31 is configured to collect a second voltage value output by the voltage dividing branch 2111, and is connected to the second voltage outputs TP1, TP2, TP3 … … and TP13 of the voltage dividing branch 2111. In other words, the voltage collector 31 is connected to the connection points TP1, TP2, and TP3 … … TP13 of the voltage dividing resistors R1 and the rheostat R2 of each voltage dividing branch 2111 through wiring. In this embodiment, the voltage collector 31 is a multi-channel voltage collector 31, and the multi-channel voltage collector 31 can be connected to the multi-channel voltage dividing branch 2111 through one voltage collector 31 to collect the second voltage of the multi-channel voltage dividing branch 2111. In other embodiments, the voltage collector 31 may also be a single-channel voltage collector 31, and the same collection purpose can be achieved by a plurality of voltage collectors 31.

As shown in fig. 4A and 4B, the second voltage value collected by the voltage collector 31 is a voltage output by the cell voltage simulation module 21 simulating a cell, and the second voltage value is equivalent to a voltage actually output by a cell of a lithium battery, and is used for comparing and analyzing the cell voltage collected by the BMS board 60 when the BMS board 60 is tested, so that the voltage collection function and the collection accuracy of the cell of the BMS board 60 can be tested through the comparison and analysis.

As shown in fig. 2 and 4C, the discharge simulation module 22 is used for simulating the current output of the lithium battery when the lithium battery is discharged through the BMS board 60, and includes an electronic load 221 and a current interface 222. The electronic load 221 is a high-precision adjustable electronic load 221, and the power of the electronic load is adjustable, so that the parameters of the discharge simulation module 22 are adjusted to test the current collection function of the BMS board 60. In this embodiment, the electronic load 221 satisfies a power consumption requirement of 3KW, has a short circuit function, and has an instantaneous overcurrent capability of 200A, so that the safety of the test can be ensured. The current interface 222 is connected to both ends of the electronic load 221, and is used to connect to the current collecting port 62 of the BMS board 60, so that the BMS board 60 can collect current passing through the electronic load 221. In this embodiment, there are two current interfaces 222.

As shown in fig. 4A and 4C, the current collector 32 is used to collect the current value of the simulated lithium battery when the simulated lithium battery is discharged through the BMS board 60. The current collector 32 is connected in series between the electronic load 221 and the current interface 222, and can collect the current flowing through the electronic load 221. The current value collected by the current collector 32 is an actual current value of the simulated lithium battery when the lithium battery is discharged through the BMS board 60, which is equivalent to an actual current value of the lithium battery when the lithium battery is discharged through the BMS board 60, and is used for comparing and analyzing the current value collected by the BMS board 60 through the current interface 222, so that the current collection function and the collection precision of the BMS board 60 can be tested through the comparison and analysis.

As shown in fig. 4A and 4F, the temperature simulation module 23 is used for simulating temperature variation of the lithium battery during operation, and is connected to the power module 10. The temperature simulation module 23 includes a temperature interface 231 and a first potentiometer 232. One end of the first potentiometer 232 is connected to the negative electrode of the power module 10, and the other end thereof is connected to the temperature interface 231. The temperature interface 231 is used to connect with the temperature collection port 63 of the BMS board 60 so that the BMS board 60 can collect the temperature of the simulated lithium battery. Since the temperature sampling devices on the BMS board 60 are all thermistors, and the resistance of the thermistors decreases with the increase of temperature and increases with the decrease of temperature, in this embodiment, the resistance change of the thermistors can be simulated by using the first potentiometer 232 with adjustable resistance, which is equivalent to the temperature change. Like this, through adjusting the resistance of first potentiometre 232, alright simulate out the temperature variation of lithium cell during operation for BMS board 60 accessible temperature interface 231 and gather corresponding temperature parameter value. Through carrying out comparative analysis with the temperature parameter value that BMS board 60 actually gathered and the equivalent temperature value of first potentiometre 232, just can test the temperature acquisition function and the collection precision of BMS board 60.

As shown in fig. 4A and 4E, the communication module 40 is used to connect the BMS board 60 and the computer terminal 50 loaded with a test program, to test the communication function of the BMS board 60, and to realize data interaction between the BMS board 60 and the computer terminal 50. The communication module 40 may be a known communication module such as a CAN module.

As shown in fig. 2, the cell voltage simulation module 21, the discharge simulation module 22, and the temperature simulation module 23 constitute the parameter adjustment module 20 of the present embodiment. The parameter adjustment module 20 may adjust the second voltage output by each voltage dividing branch 2111 through a rheostat R2 to simulate the actual voltage output of the battery cell. The parameter adjusting module 20 may simulate a current condition of the lithium battery when the lithium battery is discharged by the BMS by adjusting the power of the electronic load 221. The parameter adjusting module 20 can simulate the temperature variation of the lithium battery during operation by adjusting the resistance of the first potentiometer 232. Therefore, the voltage output and various working states of the lithium battery can be simulated by adjusting the rheostat R2, the electronic load 221 and the first potentiometer 232, so that the BMS board 60 can be conveniently tested.

As shown in fig. 3, the current collector 32 and the voltage collector 31 constitute a parameter collecting module 30 of the present embodiment, which is used for collecting actual parameters adjusted during testing, so as to facilitate comparing and analyzing the actual parameters with parameters collected by the BMS board 60, and to verify the function of the BMS board 60.

The voltage output, the discharge current, and the temperature change simulated by the parameter adjusting module 20 can directly test the voltage collecting function, the current collecting function, the temperature collecting function, and the collecting precision of the BMS board 60. For the lithium battery, the output voltage, the discharge current and the temperature parameter are basic parameters, and the change of the parameters determines the execution action of the BMS board 60, so that when the parameter adjusting module 20 adjusts the parameters to change the output voltage, the discharge circuit and the temperature thereof, the BMS to be tested should generate corresponding execution actions, such as overvoltage protection, overcurrent protection, overshoot protection, overdischarge protection and the like, and the protection function of the BMS board 60 can be verified by acquiring the protection action responded by the BMS board 60 and comparing and analyzing the protection action with the actual setting parameters acquired by the parameter acquiring module 30, such as verifying whether the protection action responds correctly, whether the response speed of the protection action meets the design requirements and the like. In addition, the SOC (state of charge) of the lithium battery estimated by the BMS board 60 is also estimated according to parameters such as voltage, temperature, and the like, and thus the SOC estimation accuracy of the BMS board 60 can be tested by comparing and analyzing the parameters actually set by the parameter adjustment module 20 with the SOC estimated by the BMS board 60. In addition, it is possible to verify whether the communication capability of the BMS board 60 is normal through the communication module 40, and further, after the BMS board 60 performs data interaction with the PC terminal through the communication module 40, it is possible to verify the software function of the BMS board 60 according to the data after the interaction.

By this, the BMS board testing device of the embodiment is formed, and it is provided with the voltage interface 212, the current interface 222, the temperature interface 231 for being connected with the BMS board 60 to be tested, so that the voltage output and the working state of the lithium battery can be simulated by adjusting the parameter adjusting module 20 to test the BMS board 60 without depending on the lithium battery to test the BMS board 60, thereby improving the testing efficiency and ensuring the testing safety.

Example 2

As shown in fig. 1, the present embodiment provides a BMS testing system including the BMS board testing apparatus described in embodiment 1 and a computer terminal 50 loaded with a test program. The computer terminal 50 is connected with the communication module 40, and the communication module 40 can be connected with the BMS board 60, and thus, the computer terminal 50 can communicate with the BMS board 60 through the communication module 40. During testing, the voltage collecting port 61, the current collecting port 62, the temperature collecting port 63, and the communication interface of the BMS board 60 are respectively connected to the voltage interface 212, the current interface 222, the temperature interface 231, and the communication module 40 of the BMS board testing apparatus, so that the computer terminal 50 can acquire the state parameters of the BMS board 60. The state parameters of the BMS board 60 include, but are not limited to, a voltage value, a temperature value, a current value collected by the BMS board 60, and SOC parameters estimated from the voltage value and the temperature value, and state codes representing the response of the BMS board 60 to the protection state, and the like. The computer terminal 50 may compare and analyze the state parameters of the BMS board 60 with parameters set when the BMS board testing device simulates a lithium battery, thereby testing the performance of the BMS board 60 to evaluate the test result of the currently tested BMS board 60.

The test program loaded on the computer terminal 50 may refer to the known technology, and its functions include but are not limited to: the functions of collecting current and collecting accuracy of the BMS board 60, the functions of collecting voltage and collecting accuracy of the BMS board 60, the functions of collecting temperature and collecting accuracy of the BMS board 60, the functions of responding to a protection operation of the BMS board 60, the SOC estimation accuracy of the BMS board 60, the communication functions and software functions of the BMS board 60, and the like are analyzed.

In addition, to test the speed of the BMS board responding to the protection action, the system may further include an oscilloscope. The oscilloscope is connected with the BMS board, and can detect the response time of the protection action of the BMS board 60, and further verify whether the response speed of the protection action of the BMS board 60 meets the design requirement.

Example 3

The embodiment provides a BMS board testing method, which is used for testing a BMS board 60 to be detected by building a power supply circuit with adjustable output voltage and an adjusting circuit with adjustable parameters to simulate the voltage output and the working state of a lithium battery, and the testing method simulates the lithium battery by using the circuit with adjustable parameters, so that the BMS board 60 can be tested under the condition of not using the lithium battery, the testing efficiency can be improved, and the testing safety can be ensured.

The BMS board testing method comprises the following steps:

s1: simulating a lithium battery by using the power supply module 10 to generate a first voltage with adjustable voltage range;

s2: connecting a parameter adjusting module 20 with the power module 10 to simulate a normal working state and/or an abnormal working state when the lithium battery works;

s3: the parameter collection module 30 is connected to the parameter adjustment module 20 to detect an actual parameter when the parameter adjustment module 20 outputs to the BMS board 60 after parameter adjustment.

S4: collecting the state parameters of the BMS board 60, analyzing the state parameters of the BMS board 60 and the actual parameters collected by the parameter collection module to evaluate the test result of the BMS board (60).

Specifically, in step S1, the power module 10 can output a dc voltage ranging from 0V to 60V through manual adjustment. During testing, the output voltage value can be adjusted according to the requirement. The structure of the power module 10 can refer to embodiment 1, and includes an AC-DC power supply 11 and a second potentiometer 12, and the power circuit can output a DC voltage of 0-60V through manual adjustment of the second potentiometer 12.

In step S2, the parameter adjustment module 20 includes a cell voltage simulation module 21, a discharge simulation module 22, and a temperature simulation module 23; step S2 includes:

s21: the single battery voltage simulation module 21 is used for dividing the first voltage and outputting a second voltage with adjustable range to simulate the voltage output of the single battery;

s22: simulating the current output of the lithium battery when discharging through the BMS board 60 using the discharge simulation module 22;

s23: the temperature simulation module 23 is used for simulating the temperature change of the lithium battery during operation.

In step S21, the structure of the cell voltage module 21 can refer to embodiment 1, which includes a plurality of voltage dividing branches 2111 connected in parallel. In specific implementation, the voltage dividing branches 2111 are provided according to the number of the voltage collecting ports 61 of the BMS board 60. For example, when 13 voltage collecting ports 61 of the BMS board 60 are provided, the voltage dividing branch 2111 may be provided with 13 paths. In this embodiment, the 13 voltage dividing branches 2111 are connected in parallel and are respectively connected to a power circuit. Each voltage dividing branch 2111 can simulate the voltage output of one battery cell, so that the voltage acquisition port 61 of the BMS board 60 can be tested. The structure of the voltage dividing branch 2111 can refer to the structure of the voltage dividing branch 2111 in embodiment 1. Each branch of the voltage division branch 2111 can output a direct-current voltage with a range value of 0.5-4.5V, and the voltage output of the branch is led out from the connection position of a voltage division resistor R1 and a rheostat R2. By adjusting the rheostat R2, the voltage dividing branch 2111 can output a dc voltage of a desired magnitude, and thus can be used for simulating the voltage output of the battery cell. In this step, the connection wires are respectively led out from the connection points of the voltage dividing resistors R1 and the varistors R2 to be connected to the voltage collecting ports 61 of the BMS board 60 one by one, so that the voltage outputted from the voltage dividing branches 2111 may be outputted to the BMS board 60 to simulate the BMS board 60 collecting the voltage of the battery cells.

In step S22, the discharge simulation module 22 may refer to the structure of embodiment 1, which includes the electronic load 221. In step S3, the electronic load 221 is a high-precision adjustable electronic load with adjustable power, so that the current during discharging can be adjusted by adjusting the electronic load 221, thereby simulating the current output of the lithium battery during discharging through the BMS board 60. Both ends of the electronic load 221 are connected to the current collecting ports 62 of the BMS board 60, respectively, so that the BMS board 60 can collect the discharge current.

In step S23, the structure of the temperature simulation module 23 refers to embodiment 1, which includes the first potentiometer 232. In this step, the resistance change of the first potentiometer 232 may be equivalent to a temperature change because the temperature sampling devices on the BMS board 60 are all thermistors, and the thermistors have characteristics in that the resistance decreases with the increase of temperature and increases with the decrease of temperature, and thus, the resistance change of the thermistors may be simulated by adjusting the resistance of the first potentiometer 232, thereby being equivalent to a temperature change. One end of the first potentiometer 232 is connected to the negative electrode of the power circuit, and the other end is connected to the temperature acquisition port 63 of the BMS board 60. Through adjusting the resistance of first potentiometre 232, alright simulate out the temperature variation of lithium cell during operation, BMS board 60 alright gather corresponding temperature value. Through the temperature value after the temperature value that gathers BMS board 60 and first potentiometre 232 equivalence carries out comparative analysis, alright test BMS board 60's temperature acquisition function is normal to and the precision of temperature acquisition.

In step S3, the parameter collecting module 30 includes a voltage collector 31 and a current collector 32; step S3 includes:

s31: connecting the voltage collector 31 with the second voltage output to collect a second voltage value output by the single battery voltage simulation module 21;

s32: the current collector 32 is connected in series to the discharge simulation module 22 to collect a current value of the power module 10 when discharging through the BMS board 60.

Since the voltage value collected by the BMS board 60 needs to be compared with the voltage actually output to the BMS board 60 when testing the voltage collection function and the collection accuracy of the BMS board 60, the voltage collector 31 needs to be further provided to collect the dc voltage value output by the voltage dividing branch 2111 in step S3. The collecting point of the voltage collector 31 is arranged at the connection position of the voltage dividing resistor R1 and the rheostat R2, and collects the actual voltage value output by each voltage dividing branch 2111 to the BMS board 60 in real time, so that the voltage collector can be used for subsequent comparative analysis.

Since it is necessary to compare the current value collected by the BMS board 60 with the actual current value discharged through the BMS board 60 when testing the current collection function and the collection accuracy of the BMS board 60, the current collector 32 is further provided to collect the actual current value flowing through the electronic load 221 in step S3. The current collector 32 is serially connected between the electronic load 221 and the current collecting port 62 of the BMS board 60, and collects an actual current value flowing through the electronic load 221 in real time, so that it can be used for subsequent comparative analysis.

Step S4, specifically including the steps of:

s41: the BMS board 60 is connected to the PC 50 loaded with the test program by using the communication module 40;

s42: collecting the state parameters of the BMS board 60 through the PC 50 and the communication module 40;

s43: the function of the BMS board 60 is tested by analyzing the state parameters of the BMS board and the voltage value collected at the step S31, the current value collected at the step S32, the temperature-equivalent resistance value set at the step S23 through the PC 50, and the test result of the BMS board 60 is evaluated.

In step S41, the BMS board 60 is connected to the computer terminal 50 by the communication module 40, for the purpose of: verifying whether the communication capability of the BMS board 60 is abnormal, if the communication capability of the BMS board 60 is abnormal, the computer terminal 50 and the BMS board 60 cannot smoothly communicate; if the communication capability of the BMS board 60 is normal, the computer terminal 50 can communicate with the BMS board 60, so that data interaction can be performed, and the BMS board 60 can send the collected voltage value, current value, temperature value and other related parameters to the computer terminal 50, so that the computer terminal 50 can conveniently perform comparative analysis on all data, and the function and test result of the BMS board 60 can be comprehensively evaluated. The way in which the communication connection between the BMS board 60 and the computer terminal 50 is established CAN be referred to the known art, for example, by establishing communication through a CAN module.

If the BMS board 60 can normally communicate with the computer terminal 50 in the step S41, the process proceeds to a step S42, where the state parameters of the BMS board 60 are collected through the computer terminal 50 and the communication module 40. The state parameters of the BMS board 60 include, but are not limited to, a voltage value, a current value, a temperature value collected by the BMS board 60, and a plurality of related parameters such as a state code indicating a response of the BMS board 60 to a protection state, and an SOC estimated based on the voltage value, the current value, the temperature value. The state parameters of the BMS board 60 are collected in order to compare and analyze actual parameters set at the time of testing, thereby testing and evaluating the performance of the BMS board 60.

In step S43, when the computer terminal 50 performs the analysis test, it includes the following steps:

s431: and comparing and analyzing the voltage value actually collected by the BMS board 60 with the voltage value collected in the step S31 to test the voltage collection function and the collection accuracy of the BMS board 60. In this step, the voltage output of the voltage dividing branch 2111 can be adjusted by adjusting the resistance value of the rheostat R2 for multiple times, so as to obtain multiple sets of data for testing, thereby improving the testing accuracy of this step.

S432: and comparing and analyzing the current value actually collected by the BMS board 60 with the current value collected in the step S32 to test the current collection function and the collection accuracy of the BMS board 60. In this step, the discharge current may be adjusted by adjusting the power of the electronic load 221 multiple times, so as to obtain multiple sets of data for testing, thereby improving the testing accuracy of this step.

S433: and performing equivalent comparative analysis on the actually collected temperature value of the BMS board 60 and the resistance value of the second potentiometer 12 set in the step S23 to test the temperature collection function and the collection accuracy of the BMS board 60. In this step, different temperatures can be simulated by adjusting the resistance of the second potentiometer 12 for multiple times, so as to obtain multiple sets of data for testing, thereby improving the testing accuracy of this step.

S434: parameters of the rheostat R2 and/or the electronic load 221 and/or the second potentiometer 12 are adjusted to simulate abnormal working conditions of overcharge, overdischarge, overcurrent, overvoltage and the like of the lithium battery, and then the currently set parameters are compared with the protection actions responded by the BMS board 60 for analysis, so as to test whether the BMS board 60 can perform correct protection actions. For example, the resistance value of the rheostat R2 is adjusted to zero to simulate the abnormal condition of no voltage output of the single battery, and then the protection action performed by the BMS board 60 is detected to determine whether the protection action currently performed by the BMS board 60 is consistent with the protection action to be performed when no voltage output of the single battery is generated, so as to test whether the protection function of the BMS board is normal.

S435: the error codes generated by the BMS board 60 for different protection states and the parameters set by the regulating circuit are output to the actual voltage value of the BMS board 60, the actual current value discharged through the BMS board 60, and the resistance value of the first potentiometer 232 one by one for comparison analysis, and the software function of the BMS board 60 is tested.

S436: the SOC estimation accuracy of the BMS board is tested by comparing and analyzing the SOC parameters collected by the BMS board 60 with the standard model. The SOC is the state of charge of the battery, which is typically estimated from voltage and temperature values. By adjusting the second potentiometer 12 and the rheostat R2, the SOC parameter collected by the BMS board 60 may be adjusted. After the SOC parameters of the BMS board 60 are collected by the computer terminal 50, the SOC estimation accuracy of the BMS board 60 can be tested by comparing and analyzing the SOC parameters with the standard model.

In addition, in order to verify the response speed of the protection action of the BMS board 60, the detection may be performed using an oscilloscope. During detection, the oscilloscope is connected with the BMS board 60 to be tested, then the rheostat, the electronic load 221 and/or the first potentiometer 232 are adjusted to simulate the abnormal working state of the lithium battery so as to trigger the response of the protection action of the BMS board, and then the response time of the protection action of the BMS board 60 is detected through the oscilloscope so as to test whether the response speed of the protection action of the BMS board 60 meets the design requirement.

The steps S431, S432, S433, S434, S435, and S436 have no sequence, and when the corresponding function of the BMS needs to be tested, the corresponding step can be selected for testing. For example, the current collection function and the collection accuracy of the BMS board 60 may be detected first, and then the SOC estimation accuracy may be verified. As another example, multiple functions of the BMS may be simultaneously tested by adjusting the varistor R2, the second potentiometer 12, and the electronic load 221.

In the test method of the present embodiment, the adjustment of the varistor R2, the second potentiometer 12, and the electronic load 221 is performed manually. The voltage collector 31 and the current collector 32 automatically collect output voltage and discharge circuit when the simulation lithium battery works. In step S43, when the computer terminal 50 performs the analysis test, it compares the actual set parameters with the actual state parameters of the BMS board 60, wherein the actual state parameters of the BMS board 60 are reported to the computer terminal 50 through the communication module 40, and for the computer terminal 50, the state parameters of the BMS board 60 are automatically obtained; the parameters to be actually set may be automatically input to the computer terminal 50 or may be manually input to the computer terminal 50. In this embodiment, the actually set parameters are automatically input to the computer terminal 50: the current collector 32 and the voltage collector 31 are connected to the computer terminal 50, so that the current collector 32 and the voltage collector 31 can automatically transmit collected data to the computer terminal 50.

While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the invention.

Claims

1. A BMS board testing device, its characterized in that, it includes:

the power supply module (10) is used for simulating a lithium battery and can generate a first voltage with adjustable voltage range;

the parameter adjusting module (20) is connected with the power supply module (10) and is used for simulating a normal working state and/or an abnormal working state when the lithium battery works; and provided with an interface for connection with the BMS board (60);

and the parameter acquisition module (30) is connected with the parameter adjustment module (20) and is used for detecting actual parameters when the parameter adjustment module (20) is output to the BMS board (60) after parameter adjustment.

2. The BMS board testing device according to claim 1, characterized in that said parameter adjusting module (20) comprises:

and the single battery voltage simulation module (21) is connected with the power supply module (10) and can divide the first voltage and output a second voltage with adjustable range so as to simulate the voltage output of the battery.

3. The BMS board testing device according to claim 2, characterized in that said cell voltage simulation module (21) comprises:

the voltage dividing circuit (211) is provided with a plurality of voltage dividing branches (2111) which are arranged in parallel, the voltage dividing branches (2111) comprise voltage dividing resistors R1 and a rheostat R2 which are arranged in series, one end of each voltage dividing resistor R1 is connected with the positive pole of the power supply module (10), the other end of each voltage dividing resistor R2 is connected with one end of the rheostat R2, the other end of each rheostat R2 is connected with the negative pole of the power supply module (10), and the second voltage is output from the connection position of the voltage dividing resistors R1 and the rheostat R2;

and the voltage interface (212) is respectively connected with the connecting positions of the divider resistor R1 and the rheostat R2 and is used for being connected with a voltage acquisition port (61) of the BMS board (60).

4. The BMS board testing device according to claim 3, characterized in that said parameter acquisition module (30) comprises:

and the voltage collector (31) is connected with a second voltage output of the voltage dividing branch (2111) and is used for collecting a second voltage value output by the single battery voltage simulation module (21).

5. The BMS board testing device according to claim 1, characterized in that said parameter adjusting module (20) comprises:

and the discharge simulation module (22) is used for simulating the current output when the lithium battery discharges through the BMS board (60).

6. The BMS board testing device according to claim 5, characterized in that said discharge simulation module (22) comprises:

an electronic load (221) with adjustable power consumption;

and the current interfaces (222) are respectively connected with two ends of the electronic load (221) and are used for being connected with the current collection port (62) of the BMS board (60).

7. The BMS testing device according to claim 6, characterized in that the parameter acquisition module (30) comprises:

and the current collector (32) is connected in series between the electronic load (221) and the current interface (222) and is used for collecting the current value of the power supply module (10) when the power supply module is discharged through the BMS board (60).

8. The BMS board testing device according to claim 1, characterized in that said parameter adjusting module (20) comprises:

and the temperature simulation module (23) is connected with the power supply module (10) and is used for simulating the temperature change of the lithium battery during working.

9. The BMS board testing device according to claim 8, characterized in that said temperature simulation module (23) comprises:

a temperature interface (231) for connecting with a temperature collection port (63) of the BMS board (60);

and one end of the first potentiometer (232) is connected with the negative electrode of the power supply module (10), and the other end of the first potentiometer is connected with the temperature interface (231).

10. The BMS board testing device of claim 1, further comprising:

and a communication module (40) connected to the computer terminal (50) loaded with the test program, and used for connecting to the communication interface of the BMS board (60) to realize the communication between the computer terminal (50) and the BMS board (60) and verify the communication capability of the BMS board (60).

11. A BMS board testing system, characterized in that it comprises a BMS board testing device according to claims 1-10 and a computer terminal (50) carrying a test program, said computer terminal (50) being in communication with said BMS board testing device, said BMS board testing device being capable of testing a BMS board (60) to be tested by simulating the output and operating state of a lithium battery, said computer terminal (50) being capable of evaluating the test results of said BMS board (60) based on the actual parameters set by said BMS board testing device when simulating a lithium battery and the parameters collected by said BMS board (60).

12. A BMS board testing method is characterized by comprising the following steps:

s1: simulating a lithium battery by using a power supply module (10) to generate a first voltage with adjustable voltage range;

s2: connecting a parameter adjusting module (20) with the power supply module (10) to simulate a normal working state and/or an abnormal working state when the lithium battery works;

s3: and connecting a parameter acquisition module (30) with the parameter adjustment module (20) to detect actual parameters when the parameter adjustment module (20) is output to the BMS board (60) after parameter adjustment.

13. The BMS board testing method according to claim 12, characterized in that said parameter adjusting module (20) comprises a cell voltage simulating module (21), a discharge simulating module (22) and a temperature simulating module (23); step S2 includes:

s21: dividing the first voltage by using a single battery voltage simulation module (21) and outputting a second voltage with adjustable range to simulate the voltage output of a battery single;

s22: simulating current output of a lithium battery when discharging through the BMS board (60) using a discharge simulation module (22);

s23: and a temperature simulation module (23) is used for simulating the temperature change of the lithium battery during working.

14. The BMS board testing method according to claim 13, characterized in that said parameter acquisition module (30) comprises a voltage collector (31), a current collector (32); step S3 includes:

s31: connecting the voltage collector (31) with the second voltage output to collect a second voltage value output by the single battery voltage simulation module (21);

s32: and connecting the current collector (32) in the discharge simulation module (22) in series to collect the current value of the power supply module (10) when discharging through the BMS board (60).

15. The BMS board testing method of claim 12, further comprising:

s4: collecting the state parameters of the BMS board (60), analyzing the state parameters of the BMS board (60) and the actual parameters collected by the parameter collecting module to evaluate the test result of the BMS board (60).